Did I fall into riya? Need advice

I was at the masjid reading Qur'an, and there was an Arab brother sitting beside me. I started my recitation purely for Allah's sake, trying to mimic a famous Qari but keeping it quiet. Then suddenly a thought crossed my mind: 'What if he admires my voice?' I felt so embarrassed. I instantly lowered my volume, but after a moment my voice went up again naturally, and the same thought returned. I ended up whispering or moving my lips silently to avoid any showing off. I'm really worried this might be riya. Has anyone else struggled with this? What should I do?